From Sahih Bukhari (Hadith 783):
Narrated Abu Bakra:I reached the Prophet (ﷺ) in the mosque while he was bowing in prayer and I too bowed before joining the row. I mentioned it to the Prophet (ﷺ) and he said to me, "May Allah increase your love for the good. But do not repeat it again (bowing in that way)
Reference: Bukhari 783